FILE - This undated file photo provided by Northrop Grumman Corp., shows a pre-production model of a F-35 Joint Strike Fighter. Israel's defense ministry said Sunday, Feb. 22, 2015, that it will purchase 14 next-generation F-35 fighter jets for approximately $3 billion adding to the fleet of 19 U.S-made jets it already purchased in 2010. Israel plans for the stealth jet to replace its fleet of F-16 warplanes and maintain its aerial dominance in the region. (AP Photo/Northrop Grumman, File) NO SALES (The Associated Press)

FILE - In this July 7, 2006 file photo, the Lockheed Martin F-35 Joint Strike Fighter is shown after it was unveiled in a ceremony in Fort Worth, Texas. Israel's defense ministry said Sunday, Feb. 22, 2015, that it will purchase 14 next-generation F-35 fighter jets for approximately $3 billion addin...